Tube holder



FIG. 1 depicts a perspective view from one side of the tube holder;

FIG. 2 depicts a perspective view from the other side of the tube holder;

FIG. 3 depicts an bottom plan view of the tube holder;

FIG. 4 depicts a side elevated view from one side of the tube holder;

FIG. 5 depicts a front elevated view of the tube holder;

FIG. 6 depicts a side elevated view from the other side of the tube holder; and,

FIG. 7 depicts a top plan view from one side of the tube holder. 

What is claimed is the ornamental design for a tube holder substantially, as shown. 